materio-base-d7/sites/all/modules/contrib/users/friendly_register/css/friendly_register.css

#edit-name-check, 
#edit-mail-check {
  padding-left: 20px;
  background: transparent url(../img/status.png) no-repeat;
  height: 16px;
}

#edit-name-check.error, 
#edit-mail-check.error {
  background-position: 0 -16px;
}